Fin blade



FIG. 1 is a perspective view of a fin blade in accordance with the new design;

FIG. 2 is a left side view of the fin blade of FIG. 1;

FIG. 3 is a right side view of the fin blade of FIG. 1;

FIG. 4 is a front view of the fin blade of FIG. 1;

FIG. 5 is a rear view of the fin blade of FIG. 1;

FIG. 6 is a top view of the fin blade of FIG. 1; and,

FIG. 7 is a bottom view of the fin blade of FIG. 1.

The broken lines in the figures are directed to portions of the fin blade that form no part of the claimed design. 

CLAIM The ornamental design for a fin blade, as shown and described. 